Trichogramma nubilale (Hymenoptera: Trichogrammatidae): Progeny Distribution and Superparasitism in European Corn Borer (Lepidoptera: Pyralidae) 1

Abstract
Individual females of Trichogramma nubilale Ertle and Davis were exposed to various densities (1 to 12) of European corn borer (ECB), ostrinia nubilalis (Hübner), egg masses for different exposure periods (l to 120 h). This parasitoid avoided excessive superparasitism under every host density and exposure period tested. It appears that the ovipositional behavior and manner of progeny distribution of T. nubilale females are uniquely adapted to the mode of egg laying by its natural host, the ECB.

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